Biomarker Lens

Common biomarkers

  • Hemoglobin
  • Glucose
  • ALT
  • Apolipoprotein B
  • C-Reactive Protein, Cardiac
  • Ferritin
  • Alb/Creat Ratio, Urine
  • Alkaline Phosphatase
  • FSH
  • T4,Free(Direct)

Biomarkers · Chemical

Free Cortisol, Serum

A cortisol test measures the level of cortisol in your blood, urine (pee), or saliva (spit). Cortisol is a hormone made by your adrenal glands, two small glands that sit above your kidneys.

Cortisol Test, MedlinePlus, National Library of Medicine

Primary unit
ug/dL
LOINC codes
2145-1
Tests that measure Free Cortisol, Serum
Labcorp 2, Quest Diagnostics 2

Tests

Check the catalog code, specimen, method and preparation for every test that measures Free Cortisol, Serum. Select up to five tests to compare them side by side.

Labcorp 2 tests

Single-analyte tests

  • Cortisol, Free, Equilibrium Dialysis and LC/MS-MS 504020

    Serum · Fasting not stated · Turnaround 6 - 10 days

    Method and collection
    Method
    Equilibrium dialysis and high-pressure liquid chromatography (HPLC) with tandem mass spectrometry.
    Collection
    Separate within two hours of venipuncture. Transfer specimen to a plastic transport tube before freezing.
    Labcorp catalog page

Panels that include this biomarker

  • Cortisol, Free, Total With CBG (Endocrine Sciences) 500440

    3 analytes · Serum · Fasting not stated · Turnaround 6 - 12 days

    Method and collection
    Method
    HPLC/tandem mass spectrometry; radioimmunoassay (RIA); calculation of free cortisol
    Collection
    Separate serum within one hour of venipuncture. Transfer specimen to a plastic transport tube before freezing. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested .
    Labcorp catalog page

Quest Diagnostics 2 tests

Single-analyte tests

  • Cortisol, Free, LC/MS, Serum 36423

    Serum · Fasting not stated · Turnaround Set up: Mon, Fri (p.m.); Report available: 7 days

    Method and collection
    Method
    Equilibrium Dialysis • Chromatography/Mass Spectrometry
    Reference notes
    Adult 8:00 - 10:00 A.M. | 0.07-0.93 mcg/dL 4:00 - 6:00 P.M. | 0.04-0.45 mcg/dL 10:00- 11:00 P.M. | 0.04-0.35 mcg/dL
    Quest Diagnostics catalog page

Panels that include this biomarker

  • Cortisol, Free and Total, LC/MS 37077

    2 analytes · Serum · Fasting not stated

    Method and collection
    Method
    Equilibrium Dialysis • Chromatography/Mass Spectrometry
    Collection
    Collect 2 mL (1.4 mL minimum) serum or plasma and aliquot into two separate transport tubes, with 1 mL (0.7 mL minimum) in each transport tube. Specify time of day specimen was collected.
    Reference notes
    See Laboratory Report
    Quest Diagnostics catalog page

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Sources

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Lab catalogs

Reference sources

Codes and registries

Verify these ranges and sources

We compile this page from named laboratory catalogs, guidelines and studies. Labs calculate reference intervals from the people they test, for one assay method and one population group, so an interval describes that population rather than an optimal target.

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